Equipment/emissions table updates

[urwahah]

Just tracking minor improvements:

• allow editing all values across a single row at once
• add a 'de/select all' button

[t-kramer]

Adding to this:

• Scenario pre-selection drop-downs for both Equipment and Emissions

[t-kramer]

Just tracking minor improvements:

• allow editing all values across a single row at once[ ] add a 'de/select all' button

@praftery @urwahah How important do you think these features are? IMO they would be handy but not essential at this point. Leaning towards closing this issue since the main feature has been implemented.